21114444431 has 8 divisors (see below), whose sum is σ = 23533127280. Its totient is φ = 18826501248.

The previous prime is 21114444371. The next prime is 21114444443. The reversal of 21114444431 is 13444441112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21114444431 - 2⁶ = 21114444367 is a prime.

It is a super-2 number, since 2×21114444431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21114444394 and 21114444403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114444331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32684576 + ... + 32685221.

It is an arithmetic number, because the mean of its divisors is an integer number (2941640910).

Almost surely, 2^21114444431 is an apocalyptic number.

21114444431 is a deficient number, since it is larger than the sum of its proper divisors (2418682849).

21114444431 is a wasteful number, since it uses less digits than its factorization.

21114444431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65369833.

The product of its digits is 6144, while the sum is 29.

Adding to 21114444431 its reverse (13444441112), we get a palindrome (34558885543).

The spelling of 21114444431 in words is "twenty-one billion, one hundred fourteen million, four hundred forty-four thousand, four hundred thirty-one".